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fuzz: add nmblib/parse_packet target

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We want to ensure that parse_packet() can parse a packet without
crashing, and that that parsed packet won't cause trouble further down
the line.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>

Autobuild-User(master): Gary Lockyer <gary@samba.org>
Autobuild-Date(master): Wed Jan 15 21:24:31 UTC 2020 on sn-devel-184
This commit is contained in:
Douglas Bagnall
2020-01-10 15:44:27 +13:00
committed by Gary Lockyer
parent f4bafcca86
commit 0fcc2e9319
2 changed files with 61 additions and 0 deletions
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56
lib/fuzzing/fuzz_nmblib_parse_packet.c Normal file
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@ -0,0 +1,56 @@
/*
Fuzz NMB parse_packet
Copyright (C) Catalyst IT 2020
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../../source3/include/includes.h"
#include "libsmb/libsmb.h"
#include "libsmb/nmblib.h"
#include "fuzzing/fuzzing.h"
#define PORT 138
#define MAX_LENGTH (1024 * 1024)
char buf[MAX_LENGTH + 1];
int LLVMFuzzerTestOneInput(uint8_t *input, size_t len)
{
struct packet_struct *p = NULL;
struct in_addr ip = {
0x0100007f /* 127.0.0.1 */
};
p = parse_packet((char *)input,
len,
NMB_PACKET,
ip,
PORT);
/*
* We expect NULL (parse failure) most of the time.
*
* When it is not NULL we want to ensure the parsed packet is
* reasonably sound.
*/
if (p != NULL) {
struct nmb_packet *nmb = &p->packet.nmb;
pull_ascii_nstring(buf, MAX_LENGTH,
nmb->question.question_name.name);
build_packet(buf, MAX_LENGTH, p);
free_packet(p);
}
return 0;
}

5
lib/fuzzing/wscript_build
View File

@ -27,6 +27,11 @@ bld.SAMBA_BINARY('fuzz_reg_parse',
deps='fuzzing samba3-util smbconf REGFIO afl-fuzz-main',
fuzzer=True)
bld.SAMBA_BINARY('fuzz_nmblib_parse_packet',
source='fuzz_nmblib_parse_packet.c',
deps='fuzzing libsmb afl-fuzz-main',
fuzzer=True)
bld.SAMBA_BINARY('fuzz_regfio',
source='fuzz_regfio.c',
deps='fuzzing samba3-util smbconf REGFIO afl-fuzz-main',